Engineering topics
Jurgens, R. F.
Publications and source records attributed to Jurgens, R. F..
Using MOLA data to improve Earth-based radar scattering model retrievals
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Radar observations of asteroid 25143 (1998 SF36)
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Radar observations of Asteroid 1999 JM8
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Mercury north and south poles: radar imaging at 3.5 cm wavelength
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The Martian surface at human scales: using MOLA data to improve Earth-based radar measured rover trafficability
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Recent radar observations of four near-earth asteroids
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Radar Observations of the Icy Galilean Satellites During 2000 Opposition
We report results of radar observation campaigns of Europa, Ganymede, and Callisto carried out during the November/December 2000 Jovian opposition using the Arecibo 12.6 cm, Goldstone 3.5 cm, and Goldstone/VLA 3.5 cm bistatic radars. Additional information is contained in the original extended abstract.
Arecibo to Goldstone Radar Interferometric Topography of Selected Regions of Venus
New high resolution digital elevation models (DEMs) of the equatorial region of Venus will be merged with Magellan imagery in order to investigate the relationship between the emplacement of the plains and the tesserae, and rifting in Phoebe Region. Additional information is contained in the original extended abstract.
Radar Observations of Near-Earth Asteroids 2000 UG11 and 2000 UK11
Two small near-Earth asteroids, 2000 UG11 and 2000 UK11 were observed using the Arecibo and Goldstone radars a week after their discovery. 2000 UK11 is a rapidly rotating (3 min) approximately 30 m solid body. 2000 UG11 is two bodies separated by at least 300 m Additional information is contained in the original extended abstract..
Radar Observations of Binary Asteroid 2000 DP107
We present the discovery and characterization of DP107 with the Goldstone and Arecibo radars, including a detailed sequence of images showing the system's orbital motion. Additional information is contained in the original extended abstract.
GSSR Mars Delay-Doppler Data Available for MER Landing Site Assessment
Goldstone Solar System Radar (GSSR) observation of Mars made over the past 10 years are tabulated. Some of these are two station interferometric data that can now be processed using Mars Orbiter Laser Altimeter (MOLA) aided altimetry to provide North/South separation and higher resolution. New 2001 observations are targeted at Mars Exploration Rover (MER) sites. Additional information is contained in the original extended abstract.
Topographic Feature Names on Venus: Progress in 2000, Review of 1997-2000 Development, Current State, and Prospective
12 names assigned on Venus in 2000. The current list includes 1821 names of 21 feature types. 95% of names present 11 types of features. The main named types are craters - 872, and coronae - 267. These two types possess 62% of the names. Additional information is contained in the original extended abstract.
Mercury's Global Topography from Radar Ranging Data
When Mercury's radius is expanded in Legendre functions to the second degree and order, the systematic error in radar ranging data is reduced substantially. Previously, data spanning an observing interval from 1966 to 1990 were used to infer an equatorial ellipticity (a - b)/a = (540 +/- 54) X 10(exp -6) and a center-of-figure minus center-of-mass offset of (640 +/- 78) m. The magnitude of this equatorial center of figure offset implies an excess crustal thickness of 12 km or less, comparable to the Moon's excess. By comparing the equatorial ellipticity with the Mariner 10 gravity field, and assuming Airy isostatic compensation, bounds on crustal thickness can be derived. Mercury's crustal thickness is in the range from 100 to 300 km. The Mercury radar ranging observing interval has been extended from 1966 to the present. In addition, improvements in data reduction techniques have resulted in a set of Mercury ranging data less affected by systematic error, in particular the biases introduced by local topographic variations. We use this new set of reduced ranging data to improve Mercury's global topography and center-of-figure minus center-of-mass offset. New results on crustal thickness are derived, and prospects for further improvement with Mercury Orbiter data are discussed.
Radar Imaging of Mercury's North and South Poles at 3.5 cm Wavelength
The Goldstone Solar System Radar has been used to image the north and south poles of Mercury during the inferior conjunctions of February 2001 and June 2001. The sub-Earth latitude was -10.7 degrees in February during observations of the southern hemisphere, and +8.4 degrees in June during observations of the northern hemisphere. These excellent viewing angles provided an opportunity to resolve the radar bright material in polar craters at 6 km range resolution. Fine-scale (1.5 km) resolution images of the northern craters have previously been obtained at 13 cm wavelengths during the July 1999 inferior conjunction. However, due to geometric constraints, the Arecibo radar cannot observe the southern polar region of Mercury until 2004. Our new Goldstone 6 km data are a factor of two higher resolution than Arecibo data collected in March 1992 at 15 km range resolution, and will remain the most highly resolved images of the south polar region for the next few years. Additional information is contained in the original extended abstract.